改善电容层析成像的重建图像质量的方法

Method of Improving Reconstructed Image of Electrical Capacitance Tomography

本文通过对电容层析成像系统传感器各极板对形成的检测场灵敏度分布的研究。发现了常用的图像重建算法对于靠近管壁的成像对象所重建出的图像容易发生畸变的原因是由于相邻极板对的检测场灵敏度比其他极板对的灵敏度高造成的，为此提出了改进方法。仿真实验结果表明，改进后的图像重建算法所重建的图像质量得到了较大改善。

The sensing field sensitivity distributions of sensor electrode pairs of electrical capacitance tomography system are described in the paper. The discovery is that the sensitivity formed by near electrode pair is more high than ones formed by other electrode pairs, which causes the reconstructed image distortion to the imaged object close to pipe wall in existing algorithm. A modified algorithm is proposed. The results of computer simulation experiment showed a great improvement on image fidelity.